Explanation?

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From a friend:

"
Now here’s an interesting one. If anyone knows any more info, pray thee, do tell. The 3 carriages behind are all normal LU stock, and the other end is painted the usual (red front) colours. I presume it was training, but there was only one person in the cab, and it was running 'special' signs at the other end."

i9.photobucket.com/albums/a99/mulletman_aviation/Trains%20and%20Stations/UndergroundMet-AStock-AmershamSpeci.jpg

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it's half a unit of A stock basically.

Some cabs in the middle of a train were refurbed for the Chalfont - Chesham and also the ELL. Some weren't and were just left as a huge shunting cabinet. They have no radio and some don't have equipment because they have been 'robbed'

it's odd to see one on the tracks though.

I'm no expert, but most LU refurbed stock has been similarly treated. There are middle cabs that are out of use on the 72ts amongst others I know of. On the D78s they are doing all of the middle cabs for 'fleet flexibility'

[tubeprune]

The A Stock was not fully converted in all cabs for OPO conversion in the mid 80s.

The 67TS was gradually robbed so that they got down to about 10 double ended units at one time.

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thanks very much chaps ;D